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Efficient and Full-Spectrum Photothermal Dehydrogenation of Ammonia Borane for Low-Temperature Release of Hydrogen

机译：氨基硼烷的高效和全光谱光热脱氢，氢氢释放

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摘要

Efficient hydrogen release from ammonia borane (AB) with a striking hydrogen content (19.6 wt%) via thermolysis provides a promising pathway for on-board applications utilizing hydrogen energy. However, the sluggish kinetics at low temperatures and high energy consumption of thermal dehydrogenation are major obstacles for hydrogen release from AB. Herein, a novel solar-driven strategy for hydrogen production from AB at low temperature is proposed, in which Ti2O3 is utilized as a full-spectrum light absorber for photothermal-activating solid-state AB reactants to produce hydrogen. Through a reduction transformation method, nanoscale Ti2O3 particles with high chemical stability and narrow band gap are prepared, realizing a rapid production of 2.0 equivalents of hydrogen from AB at ambient temperature, with an excellent recyclable and full-spectrum-responsive photothermal dehydrogenation. Importantly, a record high photothermal activation efficiency of 35% is achieved with nanoscale Ti2O3 particles due to an enhanced local photothermal effect contributed by improved light absorption and decreased thermal conduction. Moreover, assisted with CuCl2 promoter, a release of 2.0 equivalents of hydrogen under 1.0 solar irradiation at 70 degrees C is successfully achieved, revealing its potential applications in practical vehicles based on proton exchange membrane fuel cells.
机译：通过热解具有尖锐氢含量（19.6wt％）的氨基硼烷（AB）的高效氢释放为使用氢能的板载应用提供了有望的途径。然而，低温下的缓慢动力学和热脱氢的高能量消耗是AB氢释放的主要障碍。在此，提出了一种用于低温AB的新型太阳能驱动的氢生产策略，其中Ti2O3用作全谱光吸收剂，用于光热激活固态AB反应物以产生氢气。通过减少转化方法，制备具有高化学稳定性和窄带隙的纳米级Ti2O3颗粒，在环境温度下从AB的快速产生2.0当量氢，具有优异的可回收和全光谱响应的光热脱氢。重要的是，由于通过改善光吸收和降低的热传导而导致的局部光热效应提高，纳米级Ti2O3颗粒实现了35％的记录高光热激活效率。此外，辅助CuCl2启动子，成功地实现了在1.0℃下的1.0太阳照射下的2.0当量氢的释放，揭示其基于质子交换膜燃料电池的实用车辆中的潜在应用。

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